Non-Perovskite Ionic Metal Halide Hybrids: Emerging Platforms for High-Efficiency Circularly Polarized Luminescence

• • Non-perovskite ionic metal halide hybrids achieve CPL with dissymmetry factors (glum) up to 10^-2, rivaling perovskite counterparts, while offering superior stability and solution processability for scalable device fabrication. • • Structural dimensionality regulation from 0D to 2D enables stepwise amplification of CPL, with glum values increasing by an order of magnitude per dimension increase, as demonstrated in indium-based halides (Nat Commun 2025). • • Integration of achiral and chiral organic ligands in zero-dimensional hybrids boosts CPL quantum yields to >80% while maintaining glum >10^-3, addressing the trade-off between emission efficiency and chirality (Angew Chem 2023). • • Reversible protonation-deprotonation in chiral zinc halides enables stimuli-responsive CPL switching with >90% contrast ratio, providing a robust mechanism for anti-counterfeiting and encryption applications (Angew Chem 2024).